Which statement is correct about how a Juniper Networks EX Series Switch learns MAC addresses?

Juniper EX Series switches dynamically learn MAC addresses by inspecting the source MAC address of incoming Ethernet frames. When a frame is received, the switch records the source MAC address, the ingress interface on which it was received, and a timestamp in its Ethernet switching table (MAC table). The timestamp is utilized to age out inactive entries to maintain an accurate and efficient forwarding table.

A: Switches learn from the source MAC address of incoming frames, not the destination MAC address.

B: Switches do not actively poll hosts to learn MAC addresses; learning is a passive, traffic-driven process.

C: MAC address learning is a continuous process during normal forwarding operations, not restricted to spanning-tree topology changes.

- Juniper Networks TechLibrary, "Understanding MAC Address Learning and Aging on EX Series Switches".

- IEEE 802.1D-2004, "IEEE Standard for Local and metropolitan area networks: Media Access Control (MAC) Bridges", Section 7.8 (Learning Process). https://doi.org/10.1109/IEEESTD.2004.94569